A once endangered population of peregrine falcons that nests along the upper Yukon River appears to have stabilized. North American peregrines were decimated by the pesticide DDT, and listed as an endangered species, in the early 1970s. A long running study in the Yukon Charley National Preserve has documented 53 nesting pairs for the last 3 years and a 60 to 70 percent breeding success rate. Biologist Skip Ambrose, who’s studied Upper Yukon peregrines for decades, says the birds have come a long way.
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